Thanks arun..With some applications, you can install the program in both Win 7 and in XP at the same location (so, registry entries and user settings are separate, but program files are in common location). The problem will come when you uninstall only, but you can use a registry cleaner for that...
Arun
this should be quite doable with a simple Symlink .. As I want One anti virus to run in both OS. So that I don't had to update my anti virus two times.
^^virtual pc works in xp too this should be quite doable with a simple Symlink .